package com.sky.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.sky.annotation.AutoFill;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.enumeration.OperationType;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * 分类业务层
 */
@Service
@Slf4j
public class CategoryServiceImpl implements CategoryService {

    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetMealMapper setmealMapper;

    /**
     * 新增分类
     * @param category
     */
    @AutoFill(OperationType.INSERT)
    public void save(Category category) {
        //分类状态默认为禁用状态0
        category.setStatus(StatusConstant.DISABLE);
        categoryMapper.insert(category);
    }

    /**
     * 分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        Page<Category> categoryPage = new Page<>(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());
        LambdaQueryWrapper<Category> queryWrapper = new LambdaQueryWrapper<>();
        String name = categoryPageQueryDTO.getName();
        Integer type = categoryPageQueryDTO.getType();
        queryWrapper.like(name != null && !name.isEmpty(),Category::getName,name)
                .eq(type != null,Category::getType,type);

        //下一条sql进行分页，自动加入limit关键字分页
        categoryPage = categoryMapper.selectPage(categoryPage,queryWrapper);
        return new PageResult(categoryPage.getTotal(), categoryPage.getRecords());
    }

    /**
     * 根据id删除分类
     * @param id
     */
    public void deleteById(Long id) {
        //查询当前分类是否关联了菜品，如果关联了就抛出业务异常
        Integer count = dishMapper.countByCategoryId(id);
        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //查询当前分类是否关联了套餐，如果关联了就抛出业务异常
        count = setmealMapper.countByCategoryId(id);
        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除分类数据
        categoryMapper.deleteById(id);
    }

    /**
     * 修改分类
     * @param category
     */
    @AutoFill(OperationType.UPDATE)
    public void update(Category category) {
        categoryMapper.updateById(category);
    }

    /**
     * 启用、禁用分类
     * @param category
     */
    @AutoFill(OperationType.UPDATE)
    public void startOrStop(Category category) {

        categoryMapper.updateById(category);
    }

    /**
     * 根据类型查询分类
     * @param type
     * @return
     */
    public List<Category> list(Integer type) {
        if (type == null){
            return categoryMapper.selectList(null);
        }
        LambdaQueryWrapper<Category> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(Category::getStatus,StatusConstant.ENABLE).eq(Category::getType,type);
        return categoryMapper.selectList(queryWrapper);
    }
}
